| Castel Gandolfo to Giugliano in Campania | 97.89 mi (157.55 km) |
| Castel Gandolfo to Giulianova | 95.97 mi (154.45 km) |
| Castel Gandolfo to Giussano | 322.45 mi (518.94 km) |
| Castel Gandolfo to Goito | 261.67 mi (421.12 km) |
| Castel Gandolfo to Gonzaga | 239.74 mi (385.82 km) |
| Castel Gandolfo to Gorgonzola | 307.96 mi (495.62 km) |
| Castel Gandolfo to Gorizia | 293.21 mi (471.88 km) |
| Castel Gandolfo to Gragnano | 121.05 mi (194.81 km) |
| Castel Gandolfo to Grammichele | 330.52 mi (531.92 km) |
| Castel Gandolfo to Granarolo del l'Emilia | 202.92 mi (326.57 km) |
| Castel Gandolfo to Gravina in Puglia | 205.75 mi (331.12 km) |
| Castel Gandolfo to Grezzana | 272.99 mi (439.33 km) |
| Castel Gandolfo to Gricignano d'Aversa | 94.70 mi (152.40 km) |
| Castel Gandolfo to Grosseto | 106.12 mi (170.79 km) |
| Castel Gandolfo to Grottaferrata | 3.04 mi (4.89 km) |
